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Micro-Colony Forming Unit Assay for Efficacy Evaluation of Vaccines Against Tuberculosis

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Testing the influenza-tuberculosis selective mortality hypothesis with Union Army data.

Andrew Noymer¹

¹Department of Sociology, University of California, 3151 Social Sciences Plaza, Irvine, CA 92697-5100, USA. noymer@uci.edu

Social Science & Medicine (1982)

|March 24, 2009

Summary

This study found a weak link between tuberculosis and influenza deaths in late 19th-century US Army veterans. The 1918 influenza pandemic may have impacted tuberculosis decline through cohort-level passive selection, not individual risk.

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Area of Science:

Historical Epidemiology
Public Health History

Background:

The 1918 influenza pandemic's impact on tuberculosis mortality decline is debated.
Previous research suggests the pandemic may have accelerated tuberculosis decline by increasing mortality among those with tuberculosis.

Observation:

This study analyzed mortality data of Union Army veterans in late 19th-century America.
Cox regression was used to examine the association between tuberculosis and influenza mortality.

Findings:

A weak association was found between having tuberculosis and dying from influenza.
Findings cautiously support a "passive selection" effect, where age-overlap between pandemic mortality and tuberculosis morbidity influenced outcomes.
This suggests a cohort-level selection rather than individual-level increased risk.

Implications:

The 1918 influenza pandemic's effect on tuberculosis decline may be explained by demographic overlap rather than increased individual susceptibility.
Understanding historical disease interactions is crucial for public health.
Further research into cohort effects on disease dynamics is warranted.